An easily missed melanoma

LENTIGO maligna (LM) has a very different appearance to other melanoma subtypes. 

Despite the accepted wisdom that LM is mainly a lesion of the head and neck, it can occur at any site that has chronic sun exposure and so can occur on the limbs and trunk as well (see Figures 2 and 3). 

LM is most commonly seen as an in situ lesion, but especially in warmer parts of Australia, progression to invasive disease, called lentigo maligna melanoma (LMM), may be far more common than the literature suggests. 

LMM would appear to carry the same